* {
    padding: 0;
    margin: 0;
}

html, body {
    height: 100%;
    width: 100%;
}

body {
    text-align: center;
}

button {
    height: 90px;
    width: 150px;
    font-size: 30px;
}

div.panel {
    display: none;
    position: absolute;
    height: 100%;
    width: 100%;
    left: 0;
    top: 0;
    background-color: rgba(66, 66, 66, 0.418);
}

div.login-window {
    position: absolute;
    height: 300px;
    width: 500px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background-color: white;
    border-radius: 7px;
}

div.title-bar {
    height: 50px;
    border-bottom: 1px solid brown;
}

div.title {
    line-height: 50px;
    float: left;
    margin: 0 20px;
}

div.close-button {
    line-height: 50px;
    float: right;
    margin: 0 20px;
    padding: 0 5px;
    color: red;
    cursor: pointer;
}